Packer and slip assembly expanded by internal pressure



Feb. 5; 1952 c. H

RN PACKER AND SL AESEMBLY EXPANDED BY INT AL. PRESSURE Filed Jan. 29,1949 INVENTOR. URL Hifl/V- ll TTOR/VEY- Patented Feb. 5, 1952 UNITEDSTATES FATENT OFFICE PACKER AND SLIP ASSEMBLY EXPANDED BY INTERNALPRESSURE This invention relates to a packer and slip assembly, the slipassembly being expanded and set in the well by pressure exerted withinthe pipe string, which carries the tool.

This invention is particularly adaptable to slip constructions which areused in an oil well to hold a tool or packer against longitudinalmovement within the bored well.

An object of my invention is to provide a novel slip assembly which isexpanded by pressure within the string of pipe carrying the tool, thisinternal pressure being directed evenly against the slips to efiectivelypress the slips against the bore of the well.

Another object of my invention is to provide a novel device of thecharacter stated, in which internal pressure in a string of pipe isexerted against an expandible sleeve, this expanding sleeve actingthrough wedges, which engage the slips and press the slips against thebore of the well.

Still another object is to provide a novel device of the characterstated, which is simple in construction and effective in operation.

Other objects, advantages and features of invention may appear from theaccompanying drawing, the subjoined detailed description, and theappended claims.

In the drawing:

Figure 1 is a longitudinal, sectional view of my slip and packerassembly.

Figure 2 is a sectional view taken on line 22 of Figure 1.

Referring more particularly to the drawing, the numeral I indicates apipe string upon which the tool is mounted. The pipe I screws into acollar 2, and a mandrel 3 is threaded into the collar 2. A second collar4 screws onto the lower end of the mandrel 3 and a packer 5 is mountedon the collar 4. The packer 5 may be of the type disclosed in myco-pending application Serial Number 73,471, filed January 29, 1949, oncup type packer, or it may be any other type of tool or packer desired.The expandable slip assembly 6 is mounted between the collars 2 and 4.An elastic sleeve I surrounds the mandrel 3 and fits into a seat 8 inthe collar 2, and a seat 9 in the collar 4. A plurality of ports l0extend through the wall of the mandrel 3V and ermit pressure in the pipeI to be exerted against the inside of :the elastic sleeve 1. A pluralityof wedge strips H fit against the outer face of the sleeve 1. The innerfaces of the wedges II are curved as shown at 12 so as to conform to theouter surface of the sleeve 1. The outer faces of the wedges H aresquare and fit against the inner faces of the slips l3. A plurality ofthese slips are provided around the sleeve 1, and the slips are pressedoutwardly to engage the bore H! by hydraulic pressure within the pipe I.

A plurality of springs [5 are mounted on'the collar 2, and these springspress against the upper part of the slips l3, thus holding these slipsin position in the tool. A similar group of springs 16 are mounted onthe collar 4, and engage the lower part of each of the slips [3. Thesesprings permit the slips to move inwardly and outwardly, but hold themagainst accidental displacement.

Having described my invention, I claim:

1. In a slip assembly a tubular mandrel, said mandrel having holesextending through the wall thereof, an elastic sleeve surrounding saidmandrel, a plurality of elongated slips circumferentially spaced aroundthe sleeve, wedge strips arranged between the sleeve and the slips, eachwedge strip engaging the sleeve and two adjacent slips whereby said slipare cammed outwardly on dilation of the sleeve.

2. In a slip assembly a tubular mandrel, said mandrel having holesextending through the wall thereof, an elastic sleeve surrounding saidmandrel, a plurality of elongated slips circumferentially spaced aroundthe sleeve, wedge strips arranged between the sleeve and the slips, eachwedge strip engaging the sleeve and two adjacent slips whereby saidslips are cammed outwardly on dilation of the sleeve, each of said wedgestrips being substantially triangular in cross-section.

CARL HERN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,059,901 Parrish Nov. 3, 19362,228,243 Baker Jan. 14, 1941 2,361,094 Hammer Oct. 24, 1944 2,373,005Baker Apr. 3, 1945

